Rhino feeding on toxic bush to survive

It's a case of dammed if you do, and dammed if you don't. The desert adapted black rhino of Namibia live in some of the harshest habitat in the world. The Namib is one of the oldest and driest deserts on the planet and so when it comes to food, options are limited. For many miles around the only hint of green is the toxic euphorbia that dots the landscape. Nobody really knows how the rhinos remain unaffected by the toxins in the bush, but what choice do they have- if they don't eat it they die of starvation, if the do eat it, they compromise their internal organs and suffer the consequences.